Warn on tab close when create-flow module or wizard edits have not been saved.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/create/methodCardCustomizeSession.ts

@@ -25,6 +25,28 @@ export function captureMethodCardCustomizeSnapshot<TDraft>(
   };
 }
 
+/**
+ * True when a method-card create/customize modal is open with edits that
+ * are not yet persisted — the condition for a tab/window `beforeunload` guard.
+ */
+export function isMethodCardCustomizeUnloadBlocked<TDraft>(
+  modalOpen: boolean,
+  snapshot: MethodCardCustomizeSnapshot<TDraft> | null,
+  pendingDraft: TDraft | null,
+  draftFieldBlocks: CustomMethodCardFieldBlock[] | null,
+  headerDraft: MethodCardHeaderDraft | null,
+): boolean {
+  if (!modalOpen || snapshot === null) {
+    return false;
+  }
+  return isMethodCardCustomizeSessionDirty(
+    snapshot,
+    pendingDraft,
+    draftFieldBlocks,
+    headerDraft,
+  );
+}
+
 export function isMethodCardCustomizeSessionDirty<TDraft>(
   snapshot: MethodCardCustomizeSnapshot<TDraft>,
   pendingDraft: TDraft | null,